My aims come in various segments consisting of books/days and months.
One aim is to have one book sell ten copies in a day. Another is to have a series of three 20 sales months in a row, and perhaps a 30 sale to top the charts.
I think a gauge of acceptance for my work would be to have three $10 months in a row -- how futile is that -- but my original goal was to have one month which brought in $10.
As things stand, I wouldn't hold your breath. I am getting close to the point of not writing, as Amazon sales hit a new LOW, and the only book selling on B&N is Forgestriker.